Hi Alfred Ortega,
why do you want to use grouping? We don't support this yet as we have not seen a good fit for it because of it's semantics wrt. SQL. Be aware, that there is an difference between grouping and nested ordering. Grouping is purely about ordering a new table based on aggregate values, whereas nested ordering allows more flexible sorting.
SQL Grouping therefore could only return projections like max/min/average/sum, which does not fit very well to an object or class oriented programming. With other words: With SQL grouping you would never get back your persistent objects, but some new artifical structures which contain aggregate information only.
the Telerik team
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